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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_INPUT_EVENT_WITH_LATENCY_INFO_H_
#define COMPONENTS_INPUT_EVENT_WITH_LATENCY_INFO_H_
#include "base/check_op.h"
#include "components/input/native_web_keyboard_event.h"
#include "third_party/blink/public/common/input/web_gesture_event.h"
#include "third_party/blink/public/common/input/web_mouse_wheel_event.h"
#include "third_party/blink/public/common/input/web_touch_event.h"
#include "ui/events/blink/blink_event_util.h"
#include "ui/events/blink/web_input_event_traits.h"
#include "ui/latency/latency_info.h"
namespace input {
template <typename T>
class EventWithLatencyInfo {
public:
T event;
mutable ui::LatencyInfo latency;
explicit EventWithLatencyInfo(const T& e) : event(e) {}
EventWithLatencyInfo(const T& e, const ui::LatencyInfo& l)
: event(e), latency(l) {}
EventWithLatencyInfo(blink::WebInputEvent::Type type,
int modifiers,
base::TimeTicks time_stamp,
const ui::LatencyInfo& l)
: event(type, modifiers, time_stamp), latency(l) {}
EventWithLatencyInfo() = default;
[[nodiscard]] bool CanCoalesceWith(const EventWithLatencyInfo& other) const {
if (other.event.GetType() != event.GetType())
return false;
return event.CanCoalesce(other.event);
}
void CoalesceWith(const EventWithLatencyInfo& other) {
// New events get coalesced into older events, and the newer timestamp
// should always be preserved.
const base::TimeTicks time_stamp = other.event.TimeStamp();
event.Coalesce(other.event);
event.SetTimeStamp(time_stamp);
// When coalescing two input events, we keep the oldest LatencyInfo
// for Telemetry latency tests, since it will represent the longest
// latency.
other.latency = latency;
other.latency.set_coalesced();
}
};
typedef EventWithLatencyInfo<blink::WebGestureEvent>
GestureEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebMouseWheelEvent>
MouseWheelEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebMouseEvent>
MouseEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebTouchEvent>
TouchEventWithLatencyInfo;
typedef EventWithLatencyInfo<NativeWebKeyboardEvent>
NativeWebKeyboardEventWithLatencyInfo;
} // namespace input
#endif // COMPONENTS_INPUT_EVENT_WITH_LATENCY_INFO_H_
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